package HTMLParser;

import javax.swing.*;

public class MainClass {

	public static void main(String[] args) {
		// ... Declare local variables.
		String fileName; // The file name the user entered.
		String extension; // The extension.

		// ... Input a file name and remove whitespace.
		fileName = JOptionPane.showInputDialog(null, "Enter file name.");
		fileName = fileName.trim();

		// ... Find the position of the last dot. Get extension.
		int dotPos = fileName.lastIndexOf(".");
		extension = fileName.substring(dotPos);

		// ... Output extension.
		JOptionPane.showMessageDialog(null, "Extension is " + extension);
	}
}